173795

Appears in sequences

• Least positive integer multiples of angle x such that their direction cosines form a unit vector: Sum_{k>0} cos(a(k)*x)^2 = 1, where a(1)=1, a(n+1)>a(n) and x=3-Pi/2.at n=29A080139
• a(n) = Sum_{1<=i<=j<=n} prime(i)*prime(j).at n=18A357251